Not Seasoned yet
Yes a Turntable can be added to a small layout. The link below is to my layout write up with a $10 homemade turntable. The layout also had four reversing loops and a wye and can operate 5 trains with two, 2 trains per track systems. The layout has an L shaped form and fits inside a 12ft X12ft area. This compact layout uses 027 track and 34 - 027 Marx switches but you may find some useful ideas for your wider diameter curves.
A table of contents is on Page one, at the bottom of Post 1. The TT building post 9 is on page one.
https://ogrforum.com/topic/evo...fties-era-027-layout
Charlie